History

The M40A3 is a variant of the M40 bolt-action sniper rifle used by the United States Marine Corps. The M40 was introduced in 1966. The transition to the M40A1 model was completed in the 1970s, and the M40A3 in 2001. The A3 model costs $3,200.
Each M40 is a Remington Model 700 modified by USMC gunsmiths. New M40A3s are being built, and M40A1s are upgraded to M40A3s as they rotate into the armory for service and repair.
The original M40 was a military type-classified version of the Model 700; it was factory-made, and had a one-piece wooden stock. The M40A1 and M40A3 switched to fiberglass, with new scopes added as well. The scope itself, the Schmidt & Bender 3-12 x 50 PM II Military, costs $1,000.

Singleplayer

It is not used in the missions

Multiplayer

Accuracy: 9+ / 12
Damage: 9+ / 12
Range: 12 / 12
Fire Rate: 2+ / 12
Mobility: 8 / 12
Clip Size/Reserve Ammo: 5/15
Recoil: moderate/high random
Reload Time: 1.1 First Round / 0.4 Next Round
Damage: 70
Range: 4000-5000
Rate of Fire: 70 RPM Bolt
Penetration: Large / Large Bullet
Location Damage Multiplier: Head (1.5) / Neck: (1.5) / Torso: (1.1) / Stomach: (1.1) / Limbs (1.0)
Hip Accuracy: Stand (10-15) / Crouch (9.5-14) / Prone (9-13)
Unlocked at lvl 3

The best bolt action sniper rifle when using the Stopping Power perk. With Stopping Power the M40A3 will one shot kill on all parts of the body except for the exterior limbs. The closest weapon to compare it to is the R700. The advantages of the M40A3 over the R700 are it's higher bullet capacity and it's much lower scope sway.

The downside to using the M40A3 is its low rate of fire and average power. Even though the M40A3 cannot shoot as fast as the Barrett, it is unnecessary since you rarely will miss a shot, and therefore the RPM is adequate. The power is lower than the Barrett and R700 as well.

Challenges